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Finding the Fourth Proportional to 1,108.06, 1,661.55 and 620.98

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Solution

The fourth proportional to 1,108.06, 1,661.55 and 620.98 is: 931.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,108.06 : 1,661.55 = 620.98 : x
  2. Step 2: Convert to fraction form
    1,108.06/1,661.55 = 620.98/x
  3. Step 3: Cross multiply
    1,108.06x = 1,661.55 × 620.98
  4. Step 4: Simplify right side
    1,108.06x = 1,031,789.32
  5. Step 5: Solve for x
    x = 1,031,789.32/1,108.06
  6. Step 6: Final answer
    x = 931.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.